Method of colored photographic reproduction.



.N o Drawing.

JOHN LnwIsoHn, on NEW YORK, 1v. Y.

i T on METHOD or nominal) PHOTOGRAPHIG nnrnonucrion.

To all whom itmay concern Be it known that 1, JOHN Lnwl sormaa citizen of the United States, and a resident of the city of New .York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Method of Colored Photographic Bepro-= 'duction,,of which the following is a full, clear, and exact description.

This invention relates to a method in which use is made of the blue color of a 'print is then washed, to eliminate the silver 'blue print to ,superpose a series of diflerent colors to'produce a natural colors.

This invention, while varying from my Patent No. 1,071,559," granted August 26, 1913, utilizes fundamentally thesame means.

The methodconsists in obtaining three negatives of an object to be reproduced on suitable orthochror'natic silver emulsion. photographic plates with the aid ofthree reprint in substantially spective color screens by the well known nitrate and dried. Theside of the print bearing the image is then coated with a blueprint sensitizing medium. The sensitizing of the-print may be'done to advantage before the print is quite dry, to get an even coating. The resensitized print is impressed.

' with an image through the red color value negative, which'negative is adjusted-on the printfso that the imageformed by the red color value negative registers with the image under the coating "formed by the yellow color value. washed with a. red color wash, such as red The blue print so formed is.

eosin and then dried and treated witha bath of 'silvern'rtrate, strong enough to dissolve the blue, leaving the red image on the yellow image previously formed. After washing I .and drying these-formed print, the side having the images is recoated with a blueprint sensitizing medium,'the same as pre- Specification of Letters Patent.

Patented Jan. 2c, 1915..

Application filed a ruaiem. Serial No 829,254. I

viously stated, dried-and exposed to produce an image through the negative having a blue color value,- which image will properly register with the images formed bythe prevlous negatives. The print so formed will have the blue color, the red color and the s yellow" color placed successively in-the order described; and in combination will produce a picture off substantially natural color, 5. 6., the image on the print of the object will be substantiallyin its natural colors.

It is-self-evident that the process can be 'used 'with'only two,or with more than three colors if desired. Theprinciple of the process consists in forming a series of superpos' ing blue images, of which the preceding blue color of the image has been substituted by another color before the ,succeeding blue image has been formed.

Having thus described my invention, T claimas new and desire to secure by Letters Patent: p p 1. A method for producing on blue prints a plurality of color effects from difierent color value negatives, which consists in making a blue print from a negative containing a yellow color. value, then treat-ingthe blue of the image with a yellow wash and a blue dissolving substance, thus forming a yellow image, then coating the image so formed with a blue-print sensitizer and forming a second, blue print from a negative containing 'red color values, then washing said soformed second print with a red color wash and" a blue-dissolving substance, leaving a red image over the yellow image, then coat ing said red image with a blue-print sensitizerand forming a blue image thereon from a negative having the blue color values.

'2. A method for producing onblue prints a plurality of color eflects from dilferent color value negatives which consists in forming a blue image, substituting for the blue of the image .the color of the same value as the negative with which the blue image has been formed, coating the so-formed image with a blue-print sensitizer, making another blue image, substituting for the blue of the image the color of same value as the negative with which the second blue image has been formed, coating the second image with a blue-print sensitizer and making the final image with anegative having the blue color 5 values.

' 3. A method for producinglprints having a plurality of colorefiects, which consists in forming a blue print, substituting for the blue of the image a different color, coating the so-formed'image with a blue-printsensitizer, making another blue print, substituting for the blue of the image a color difier ent from the blue and first different color used, coating the so-formed image with a blue-print sensitizer and forming a blue image thereon. I,

4. A method for producing prints having a plurality of color effects, which consists in forming a blue print, substituting for the blue of the image ayellow color, coating the so-formed tyellow image with a blue-print orming a second blue print, sub; 15

sensitizer, stituting for the blue of the second image a red color, coating-the so-formedred image with a blue ,print sensitizer and forming a blue image.

In witness name to this specification in the presence of two subscribing witnesses.

' JOHN LEWISOHN. 'Witnesses:

-B. JOFFE,

Pnmng D, ROLLHAUs.

whereof I have signed my 20 

